Electric igniter for explosion-engines.



No. 734,862. PATENTED JULY 28, 1903.

G. A. GOODSON.

ELECTRIC IGNITER FOR EXPLOSION ENGINES.

APPLICATION FILED MAR. 13, 1903.

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ELECTRIC IGNITER FOR EXPLOSION ENGINES.

APPLICATION FILED MAR-.13, 1903. m

N0 MODEL.

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G. A. GOODSON. ELECTRIC IGNITER FOR EXPLOSION ENGINES.

APPLICATION FILED MAR. 13, 1903. H0 MODEL. 3 SHEETS-SHEET 3.

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TatentedJuly 28, 1903.

PATENT ()FFICE.

UNITED STATES.

GEORGE ARTHUR GOODSON, or PROVIDENCE, RI-IODE ISLAND.

SPECIFICATION forming part of Letters Patent No. 734,852, dated July 28, 1903. Application filed March 13,1903. Serial No, 147,558- (No model.)

on a suitable bearingprojecting from the To all whom i m y concern: standard construction, it is suflicient for the Be itknown that I, GEORGE ARTHUR GOOD- purposes of this case to mark the castings l SON, a citizen of the Dominion of Canada, reand the crank-shaft 2. The electric generator 5 siding at Providence, in the county of Proviis in the form of an alternating magneto 5 dence and State of Rhode Island, have inhaving an H-armature wound with fine wire. vented certain new and useful Improvements This magneto, asshown, is mounted 011 a in Electric Igniters for Explosive-Engines; bracket 3, fixed to the engine-castings 1. and I do hereby declare the following to be a' The engine crank-shaft 2 is, as shown, profull, clear, and exact description of the in vided with a sprocket 4. The magneto, as

:0 vention, such as 'will enable others skilled in shown, is made up of a brass base 5, polethe art to whichit appertains to make and use pieces 6, permanent magnets 7, and the ro the same. tary armature 8. The magnets 7 and the My invention relates to electric igniters for pole-pieces 6 are rigidly secured together and explosive-engines, and is in the nature of an arc angularly adjustable on bearing-flanges 9,

15 improvement on the electric igniter described projecting inward from the end plates of the in my prior pending applications, Serial No. base 5, as best shown in Fig. 8. The pole- 86,009, filed December 16, 1901, and Serial pieces 6 are made of the proper concave shape No. 98,465, filed March 17, 1902, and allowed at their ends, as shown in Fig. 7 to fit the November 7, 1902; and to this end the invenbearing-flanges 9 when the parts are in work- 20 tion consists of the novel devices and combiing position. Said pole-pieces 6 are also pronations of devices hereinafterdescribed, and vided with ribs or flanges 10, which project defined in the claims. between the permanent magnets 7 and space In the drawings the invention is illustrated the same apart from each other. Two of as applied to a two-cycle explosive-engine. these ribs 10 project outward beyond the per- 2 5 In said drawings, like notations referring manent magnets, one from each side of the to like parts throughout the several views, body of themagneto, and are made of seg- Figure 1 is a View in front elevation with mental form on their outer faces for intersome parts broken away, showing the imchangeable cooperation with a set-screw 11, proved igniter in working position in respect which set-screw 11 may be interchangeably 0 to the engine. Fig. 2 is a detail, chiefly in seated in either of the side plates of the base transverse vertical section on the line 00 and thereby be made to work against either of Fig. 4, with some parts broken away and of the projecting ribs 10 to lock the body of others shown by dotted lines in diagram. the magneto in any desired angular adjust- 85 Fig. 3 is a front end elevation of the magneto ment in respect to the base, as best shown 5 detached with the parts in normal or idle in Fig. 8. One terminal of the armatureposition. Fig. 4 is a view showing the magwinding is soldered or brazed fast to the armaneto chiefly in side elevation, 'but with some ture-shaft in direct contact therewith, whence parts broken away and some parts shown in the current can pass through the engine-cast- 0 section. Fig. 5 is a detail in vertical transings 1 to the movable electrode 29, and the 4o verse section on the line m :r of Fig. 4, but other terminal of the armature-winding is with some parts broken away, but with the insulated from the, armature-shaft and conparts in the same position as shown in Fig. nected to a contact-ring 12, fixed to but in- 6. Fig. 6 is a similar view to Fig. 3, but with sulated from the armature-shaft. A brush the movable parts shown in a diiferent posicontact 13 may be interchangeably seated in 5 tion-to wit, neartrippingposition. Fig. 7 is opposite sides of the base 5 to engage with a view in front elevation, showing the pereither side of the contact-ring 12 as may be manent magnets andpole-pieces or what'may desired, and this brush contact 13 is conbe called the body of the magneto removed nected by wire 30 with the fixed electrode 28. from the armature and the base of the mag-v The sprocket a, fixed to the engine-shaft 5o neto; and Fig. 8 is a horizontal section on the 2, is shown as connected by a chain 14 with line m 00 of Fig. 4. a loose sprocket 15 of the same size mounted The engine shown being of a well-known front plate of the magneto-base 5, which bearing is concentric with and forms a part of the bearing for the armature-shaft, as best shown in Fig. 8. Said sprocket is provided with a driving-stud 16 on its outer face for cooperation with an internal driving-lug 18, projecting from the inner face of a channeled crank-disk 17, fixed to the outer end of the armature-shaft alongside the sprocket 15, as best shown in Figs. 4, 5, and 8. The crankdisk 17 is provided with a wrist-pin 19, engaging the headed lower end of a thrust-rod 20. The upper end of said thrust-rod 2O slides freely through the head of a swiveled guide-bolt 2], seated in the upper end of a bearing-bracket 22, fixed to the pole-pieces 6 of the magneto. An impelling-spring 23 is coiled about the thrust-rod and is compressed between the headed lower end of said rod and the head of said swiveled guide-bolt 21. A flat spring-plate 24, fixed at its intermediate portion to the headed lower end of the thrust-rod 20, constitutes a two-tipped brake-shoe for cooperation with the two camended friction-ribs 25 and 26 on the face of the crank-disk 17, which friction-ribs are of segmental form, and the rib 26 is much longer than the rib 25. The long upper tip of the brake-shoe under the rotation of the crank-shaft wipes the oiling-pad 27, fixed to the bearing-bracket 22. The thrust-rod 20 is hollow and holds oil for the wrist-pin 19. The movable electrode 29 is provided with a crank-arm 31, connected by rod 32 with the free end of a cam-lever 33, pivoted to the fixed arm 34, projecting from the bearingbracket 22, as best shown in Figs. 2, 4, and 7. The cam-lever 33 is subject to a spring 35 and has alateral flange 36, bearing against a cam 37, fixed to the rear end of the armature-shaft, as best shown in Figs. 2 and 4.

Operation and adocmtages.l3y the sprocket 4 and the chain 14 the loose sprocket 15 on the magneto is kept in continuous motion from the en gine-shaft. The impelling-spring 23, reacting against the swiveled guide-bolt 21 as its base of resistance, tends to hold the parts subject thereto in the position shown in Figs. 1, 3, and 4 as their normal or idle position, with the crank-pin 19 at or near its lower dead-center. Under the rotation of the loose sprocket 15 its lateral stud 16 comes in contact with the internal lug 18 of the crank-disk 17 and will rotate the crank-disk with the sprocket for a little more than a half-revolution, thereby forcing the springimpelled parts from their idle position (best shown in Fig. 3) into and slightly beyond the position best shown in Fig. 6. Under this driving section from the sprocket 15 on the crank-disk 17 the spring 23 will be put underconsiderably-increased tension, and when the crank-pin 19 passes its upper dead-center, as it is shown about to do in Fig. 6, the spring 23 will become instantly operative to throw the crank-disk and the armature forward in advance of the sprocket 15 for the remainder the crank-disk 17 and the armature 8 isat a I speed sufficiently rapid to cause the magneto to generate a current of high electromotive force and render the same available to the igniter-circuit. hen the spring impelled parts are in their normal or idle position, as shown in Figs. 1, 2, 3, and 4, the cam 37 on the armature shaft acting on the cam-lever 33 holds the movable electrode 29 away from the fixed electrode 28, as shown in Figs. 1 and 2, thereby keeping the igniter-circuit open at that point; but before the spring-impelled parts are brought into tripping position (best shown in Fig. 6) the cam will have rotated far enough to permit the cam-lever spring 35 to have forced the rod 32 and the movable electrode 29 yieldingly upward into tight contact with the fixed electrode 28, thereby closing the igniter-circuit at the electrodes before the impelling-spring 23 is tripped into action, and hence when the impelling-spring is tripped into action the igniter circuit being closed the generating action will occur under the spring-impelled throw of the armature, and near the limit of said spring-impelled throw of the armature the cam 37 will become operative to pull down the movable electrode 29, thereby opening the circuit and producing the spark in the explosion-chamber of the engine substantially at the instant of maximum generation. It will be seen, therefore, that the impelling-sprin not only imparts the quick or generating throw to the armature, but also throws the movable electrode 29 into its open or circuit-breaking position against the tension of the comparatively light cam lever spring 35. The impellingspring 23 reacts against the swiveled guide-bolt 21 as its base of resistance on a line which crosses the axis of the armature in each revolution of the crank-disk, and as the bracket 22 is angularly adjustable with the pole-pieces 6, to which it is attached, it follows that the springs base of resistance may be angularly adjusted, as desired, to vary the time of the tripping of the spring into action, as shown, for example, by dotted lines in Fig. 1, and hence to vary the time of the ignition as may be desired to secure any predetermined lead in either direction of the engineshafts motion. The brakeshoe 24, carried by the head of the thrust-rod 20, is so related to the friction-ribs 25 and 26 on the crank-disk 17 that when the springimpelled parts come into tripping position, as they are shown about to do in Fig. 6, the crank-disk will be free from any braking action, but that when the spring-impelled parts approach the position best shown in Fig. 3 said brake-shoe 24 and said friction ribs 25 and 26 on the crank-disk will come into contact under considerable friction,thereby stopping the crank-disk and the armature without jar or vibration.

What I claim, and desire to secure by Let- 2. The combination with an explosive-en gine, of the magneto having an engine-driven trip loose in respect to the armature-shaft, a crank-disk fixed to the armature-shaft, and having the friction-ribs and 26, the swiveled guide-bolt 21, the thrust-rod 20, pivoted to the crank-pin and working through said guide-bolt, the impelling-spring 23, coiled around said thrust-rod, and reacting against said guide-bolt to impart the spring-impelled throw to said rod, crank-disk and armature,

and the brake-shoe 24, carried by said rod and cooperating with the said friction-ribs, on said crank-disk, to stop the spring-impelled parts without jar or vibration.

3. The combination with an explosive-engine, of the magneto having an engine-driven trip, loose in respect to the armature-shaft a crank-disk fixed to the armature-shaft, and having the friction-ribs 25 and 26, the swiveled guide-bolt 21, the thrust-rod 20, pivoted to the crank-pin and working through said guide-bolt, the impelling-spring 23, coiled around said thrust-rod, and reacting against said guide-bolt to impart the spring-impelled throw to said rod, crank-disk and armature, the brake-shoe 24:, carried by said rod and cooperating with the said friction-ribs, on said crank-disk, to stop the spring-impelled parts without jar or Vibration, and the oiling-pad 27, in position to be wiped by the brake-shoe 25, substantially as and for the purposes set forth.

4. The combination with an explosive-engine, of an intermittently-acting magneto, in the igniter-circuit, having an engine-driven trip, and an impelling-spring for imparting the generating throw to the armature, when released from said trip, at a speed independent of the speed of the engine, the cam-lever 33, the relatively light spring 35, the cam 37,

on the'armature-shaft, and a connection from said cam-lever 33 to the movable member of the electrode, in the igniter-circuit, substantially as and for the purposes set forth.

In testimony whereof I ai'fix my signature in presence of two witnesses.

GEORGE ARTHUR GOODSON.

Witnesses:

ANDREW B. PATTON, THOMAS F. WEsT. 

